Method of producing expansible-collapsible elements



Aug. 24 1926. 1,597,206

H. c. MALLORY METHOD OF PRODUCING EXPANSIBLE COLLAPSIBLE ELEMENTS FiledMarch 25, 1920 2 Sheets-She a"v 1 vwon fez W 6ml Aug. 24, 1926.1,597,206

H. c. MALLORY METHOD OF PRODUCING EXPANSIBLE COLLAPSIBLE ELEMENTS FiledMarch 25, 1920 2 Sheets-Sheet 2 amvcm-foz 67cm @mw gafiadm w A TTORNEYPatented Aug. '24, 1926.

UNITED STATES PATENT ,IIOOFFICE.

HARRY C. MALLORY, OF BELLEPOR'I, NEW YORK,

ASSIGrNOR, IBY' MESNE ASSIGNMENTS,

170 AMERICAN RADIATOR gomrANY, or NEW YORK, N. Y.,' A coRroaArIo'n orNEW mnsrnn Application filed March 23, 1920. Serial No. 368,116.

M y invention relates to. improvements, in methods of producingexpansible-collapsible elements, and the same has for its object moreparticularly to provide a method of producing corrugations in a hollowcylin-' drical or tubular blank, which method 'consists in drawing thewall of said blank over suitable dies, whereby the shape thereof isaltered without subjecting said wall to anyrolling or swaging action.

Further, said invention has for its object to provide'a method ofcorrugating a hollow cylindrical or tubular blank which consists insecuring the blank at one end to a suitable sup ort, and then subjectingit to the action 0? appropriate dies, beginning adjacent to the securedend, and working progressively outwardly therefrom and drawing the metalof'the wall from its free end over or between said dies towards its-&cured end into corrugations or folds ofsubstantiallyuniform temperthroughout. Further, said invention has for .its object.

to provide a method of producing corrugations in a hollow cylindrical ortubular blank one end of which is firmly secured to a support in whichthe wall of the blank, proceeding from said secured end towards its freeend, is passed over appropriate dies,

7 in such aamanner that the metal'of the-wall is drawn inwardly from thefree end'of said blank towards its secured end to produce a.

series of shallow corrugations, after which the blank is subjectedsuccessively to other 'dies in order to progressively deepen andcontract said corrugations.

Further said invention has for its object to provide a method ofcorrugating ahollow 40 icylindrical blank, in which the wall of the lankis initially drawn over substantially the entire efi'ective surface ofone member of a set of cooperating dies, and over a part of theeffective surface of the remaining member or members of said dies inorder to produceshallow corrugations extending approximately an equaldistance inside and outside of the original wall line or diameter of theblank, which corrugations are thereafter drawn, in succession, over orbetween additional dies serving to deepen and contract said corrugationsby reducing thev ra; dins of the curved inner and outer bends of saidcorrugations and forming intermediate portionstconnecting the ends ofsaid curved bends.

Other objects will in part beobvious, and in part be pointed outhereinafter.

To the attainment of the aforesaid objects and ends-my inventionconsists in the successive steps or operations hereinafter described andthen pointed out in' the claims.

In the accompanying drawings forming part of this specification whereinlike characters of reference indicate like parts, I have illustrated thefirst, last and several of .the intermediate steps or operationsperformed in carrying out my method, and in connec- .tion therewith theessential parts of a ma- Fig. 4, is a similar view showing the finaldrawing operation in which the corrugations are deepened and contractedto the desired extent;

.Fig. 5, is an enlarged detailside view showing. a set of dies fordrawing-the corrugations, showing the manner in which a portion of thewall of a blank is. drawn over approximately the entire effectivesurface of the upper die, andover approximately one quarter of theeffective surface of each of the .cooperating lower dies, and

Fig. 6, is a diagrammatic view showing the development of a corrugationfrom the blank to the completed corrugation in seven successive drawingoperations.

To produce a corrugated element, for use as an expansible-collapsiblevessel, I take a hollow, cylindrical blank 12 of appropriate thickness,by preference one that is open at one 'end, as 13, and closedat theother 14. The blank is then secured at its closed end 14 in a chuck 10which is freely revoluble 1 are placed in operation, rotating towardseach other, and are brought together with the wall of the blank 12therebetween. As soon as the wall of'the blank becomes 1 engaged by saidrotating dies 15, 15*, the blank and the chuck 10 supporting the same,will be caused. to rotate by the frictional engagement of the dies 15,15 with said wall. and

the'metal thereof will be drawn slightly inwardly from the free end 13of said blank towards its closed end 14, and a very shalv repeated-untilthe desired number of corru-- low. circumferential corrugation 12 formedtherein adjacent to its closed end 14. Upon completing said-firstshallow corrugation,

the dies 15, 15 are separated again and "moved outwardly. a step,towards the open 'end 13 of the blank, and then brought together againinto engagement with the wall of theblank, and a corresponding secondshallow corrugation 12. This operation is gations or bends have beenproduced in the blank.

Hereu'pon the partly corrugated blank is subjected to the second step oroperation, as lllustrated at Fig. 2, in which the dies are reversed, i.e. the upper die 17 being a large.

single one, and the lower die 17 being a small, double one whose membersare separatedfrom each other by a distance equal to the width of theupper die 17, plus double the thickness of the metal of the wall of theblankand the requisite clearance, In this second operation thecorrugations are successively deepened intosemi-circular, orsubstantially semi-circular folds extendmg approximately an \equaldistance within and without the original diameter of the blanks. Thedies 17, 17 used in this operation are oi substantially the samediameter as those used in the first operation, but are appreciablynarrower in width.

succeeding operation, however, not

necessarily the third, is illustrated at Fig. 3.

In this operation the dies are again reversed, and the upper die 18formed as a double one, and the lower, smaller die 18 as a single one.The dies in this instance are also of the same diameter as in thepreceding-constructions,-but appreciably narrower in ,-width than thoseshown at Fig. 2, and serve to deepen the corrugations somewhat furtherand bring the same more closelytogether.

The final operation is illustrated at Fig. 4 In the regular course ofoperation, several operations may'occur between the operationillustrated at Fig. 3, and that shownat Fig. 4. In said last namedfigure, the

dies 19, 19 are reversed, and the upper die 19 formed as a single die,and the lower die 19 as a double one. The dies 19, 19 are, asheretofore, of the same diameter but materially thinner in width. Inthis final operation the corrugations, as previously developed, arefurther deepened and contracted to the degree desired in the finishedproduct.

In each of the sets of dies hereinabove described the distance betweenthe inner opposi'ng faces of the double dies is always about equal tothe .widthof-the single die plus double the thickness ofthe metal of thewall of the blank to be operated upon, sufficient clearance beingprovided in each case to insure the proper drawing of the metal of thewall over and between said dies.

At Fig. 5 the operation illustrated and. described in connection withFig. 2, is represented on an enlarged scale in order to showgraphicallylthe manner in which the wall of the blank is acted upon bythe dies. In

Fig. 5 the blank is shown with .the firstpartly-drawn corrugation 12formed adja-.

' ing the metal 0 the wall of the blank inwardly from the free end13-ofthe blank, as indicated by arrows a, over and between 'theefiectivesurfaces of said dies and conformin the wall of the blank thereto.

At ig. 6 I hav shown diagrammatically the development of one corrugationfrom ,the origin corrugation resulting from the operation of a series ofseven sets of dies acting in succession upon the'wall of the blank. Inthis figure, the successive operations are illustrated by a series ofcurved lines indicated by the letters a to g inclusive.

blank to the completed' 1 It will be understood of course, that be- 7tween the initia and final drawing opera-" tions as illustrated at Figs.1 and 4, respectively, any desired number of intermedlate drawingoperations maybe performed. I

' have as a matter'of convenience shown only ,-four operations toillustrate my method.

' It is to be hoted particularly that in car-. rying out my method Iprefer tosecure one end of the blank firmly-invposition upon the chuck10 which, while capable of free rotary movement, is preferably heldagainst all longitudinal movement, and that in 1 corrugati-ng the wallof the blank I prefer to begin the operation at or adjacent to the fixedend of the blank, and progressively work outwardly towards the free endof the blank until the desired number of corrugations have been producedand .that as a result of the construction and disposition of the dieswith reference to each other, the

metalbf the wall of the shell between the.

dies and the open, free end of the blank will be. progressively drawninwardly towards, over and between said dies in the formation of thecorrugations thereby. This action'is due to the fact that the wall ofthe .5 blank between the die and the free end of the blank beingunconfined or unrestrained will offer less resistance to the drawingaction of the dies than the closedend of the blank or the corrugatedportion of the 10. blank between said dies and said closed end, and willcause the metal of the blank-to be drawn inwardly over and between saiddies and thus insure the uniform temper of the metal.

I claim and desire to secure by Letters Ifatent is:- 1. The method ofexpansible-collapsible elements which consist's in taking a cylindricalblank, securing one end 0t said'blank to a support, subjecting the saidblank to the action of suitable l dies and suc'cessively drawing thesame over saiddies from the free end of said blank towards its 'securedend to form a series of shallow, parallel corrugations therein, and

then subJcting said, b ank to the 'further action oi said dieswhereby'to progressively. deepen said corru ations and draw the same 0closer together, su stantially'as specified.

(,2. The method of roducing corrugated expansible elements w ichconsists in taking a hollow, cylindrical blank, securin one e d 1 ofsaid blank to a suppo .subj ting said blank to the action of suita e andsuccessively drawin the same over said dies from the free end 0 saidblank'towards its secured end and initially formin shallowcircumferential corrugations t erein,

and then subjecting said partially corru-" gated structure to the actionof additional sets of dies whereby furtherto draw Said blank from itsfree end towards its secured end and progressively to deepen andcontract said corrugations, substantially as specified, Thfrnethod ofroducing expansiblecollapsible elements w ich conslsts 1n takin a hollowcylindrical blank, open at one end and closed at its blank at its closedend tb a revoluble support, subjecting said blank to the action of.

a set of cooperating revolving dies, while upon said support, beginninadjacent to its 5 closed end, arid. drawing 1: e wall of said blank overand between said dies, from the free open-end of said blank towards itsclosed fixed end whereb toform corrugationstherein, substantia lasl'specified.

4. Themethod of re ucing 'expansiblecollapsible elements w ich consistsin taking a hollow, cylindrical blank having an open end and aclosed-end, securing said blank at its closed end to a revoluble ahollow Having thus described my invention, what i of said, blank towardsits free, producing corrugated- -wards its closed, secured end, over andbecollapsible elements ies of dies tions in said wall,

tract other end, securing said,

support, 'sub- 66 ectmg said blank, wh1leon said support, to

revolving wall, substantially as specified.

5. The method of producing expansible collapsible elements whichconsists in taking cylindrical blank having an open end and a closedend, securing said blank at its closed end to a revoluble support,subjecting said blank, while on said support, to the action of a set ofcooperating, revolving dies, and, proceeding from the closed, securedend open end, said blank thereof todrawing the metal of the'wall ofinwardly, from the free open end 86 tween said dies and initiallyforming shal ow corrugations in said wall, and then subjecting saidblank successively to the action of other sets of dies which serve todraw the metal ofthe wall of said blank further inwardly towards itsclosed end and to deepen and contract said corrugations, substantiallyas specified.

' 6. The method of producing 'expansiblewhich consists in taking ahollow cylindrical shell having an open end and aclosed end, securingsaid blank at its closed end to a revoluble support, subjecting saidblank, while on said support, to the action of a set of cooperatingrevolving dies, and, proceeding from the closed, secured end of saidblank towards its free, open end, drawing the metal of the wall of saidblank with a step-by-step movement inwardly from the free, open endthereof towards its closed, secured end, over andbetween said dies andinitially. forming shallow corrugaand then subjecting said blanksuccessivel to the action of other sets of revolving dies which serve todraw the metal of the wall ofsaid blank further inwardly andprogressively de'epen and consaid corrugations, substantially asSpecified. Y 7. The method of producing expansiblecollapsible. elementswhich consists in taking a hollow cylindrical shell having an open endandpa closed end,'securing said blank at its closed end to a revolublesupport, subjecting said blank, while on said support to the action of aset of cooperating, revolvm dies, and, proceeding from the secured en ofsaid blank towards its free end, drawing the metal of the wallof saidblank progressively inwardly from said free endtowards said secured endand initially forming shallow corrugationsin said wall, and thensubjecting said blank successively to the action of other sets ofrevolving dies of gradually diminishing width which serve to draw themetal of the wall of said blank further in-. wardly towards its closedend and progressively reducing the diameter of the curve inner and outerends of said corrugations and forming substantially flat, parallelporblank to the action of suitable dies and successively drawing thesame over said dies from the freeend'of said blank towards its secureden 9..The method of producing corrugated ,expansible-eollapsibleelements which conwhereby to form corrugations therein, substantially asspecified.

same at one end to a support, subjecting said (1 blank to the action ofsuit-able dies and successivelydrawing the same over said dies from thefree end of said blank towards its secured end to form a series ofshallow, par? allel corrugations therein, and then subjecting said blankto further action of dies whereby to deepen said corrugations and drawthe same closer together; all of the said several corrugating operationsproceeding from the secured end of said blank towards the free endthereof, substantially as specified.

Signed at the city of Manhattan, New

of New York, borough York County, in the State of New York,'this 28thday of Febru-' ary, one thousand nine hundred and twenty.

' HARRYC. MALLORY.

